1.4-2.0 RI Gemstone Gemology Gemological Tool Digital Gem Refractometer

1.4-2.0 RI Gemstone Gemology Gemological Tool Digital Gem Refractometer

Description:
- Each kind of gem has a typical refractive index due to its chemical composition and crystallization structure. Refractive index is one of important optical parameter, through the parameters you can judge whether the gem is an anisotropic or isotropic stone.
- This digital gem refractometer is designed to measure the refractive index of gems. With the full range from 1.400 to 2.000 RI, it can be used to test most gems. 
- A gem refractometer can be used in jewelry stores, gem workshops, museums & collections, auctions, laboratories and etc.

Features:
- No refractometer oil needed
- Read results on LCD
- Easy and simple to use

Specification:
- Product Name: Gem Refractometer
- Model: DGR-501
- Color: Silver
- Material: Alumuim Alloy
- Power Supply: 1x 9V Layer-built Battery(Not including)
- Working temperature: 5 ~ 30°C
- Measuring Range: 1.400 ~ 2.000 RI
- Item Size: approx. 105 x 60 x 35 mm

Device Calibration
- Press the "ON/OFF" button to turn on the device.
- Press and hold the test button for 5 seconds until "CAL" appears
- If the screen display 1.487, put the 1.487 calibration block, press the test key, if the screen show 1.806, put the 1.806 calibration block, press the test key. When appears "END", it means the calibration is complete.
- Please calibrate after long-term use.
- Please calibrate when the device has been subject to strong vibration.)



Package Included:
- 1 x Digital Gem Refractometer
- 2 x Standard Stone Sample (1.4875RI/1.7552RI)
- 1 x Carrying Pouch